drivers/input/mouse/sermouse.c

   1 /*
   2  *  Copyright (c) 1999-2001 Vojtech Pavlik
   3  */
   4
   5 /*
   6  *  Serial mouse driver for Linux
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include <linux/delay.h>
  26 #include <linux/module.h>
  27 #include <linux/slab.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/input.h>
  30 #include <linux/serio.h>
  31
  32 #define DRIVER_DESC     "Serial mouse driver"
  33
  34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
  35 MODULE_DESCRIPTION(DRIVER_DESC);
  36 MODULE_LICENSE("GPL");
  37
  38 static const char *sermouse_protocols[] = { "None", "Mouse Systems Mouse", "Sun Mouse", "Microsoft Mouse",
  39                                         "Logitech M+ Mouse", "Microsoft MZ Mouse", "Logitech MZ+ Mouse",
  40                                         "Logitech MZ++ Mouse"};
  41
  42 struct sermouse {
  43         struct input_dev *dev;
  44         signed char buf[8];
  45         unsigned char count;
  46         unsigned char type;
  47         unsigned long last;
  48         char phys[32];
  49 };
  50
  51 /*
  52  * sermouse_process_msc() analyzes the incoming MSC/Sun bytestream and
  53  * applies some prediction to the data, resulting in 96 updates per
  54  * second, which is as good as a PS/2 or USB mouse.
  55  */
  56
  57 static void sermouse_process_msc(struct sermouse *sermouse, signed char data)
  58 {
  59         struct input_dev *dev = sermouse->dev;
  60         signed char *buf = sermouse->buf;
  61
  62         switch (sermouse->count) {
  63
  64                 case 0:
  65                         if ((data & 0xf8) != 0x80)
  66                                 return;
  67                         input_report_key(dev, BTN_LEFT,   !(data & 4));
  68                         input_report_key(dev, BTN_RIGHT,  !(data & 1));
  69                         input_report_key(dev, BTN_MIDDLE, !(data & 2));
  70                         break;
  71
  72                 case 1:
  73                 case 3:
  74                         input_report_rel(dev, REL_X, data / 2);
  75                         input_report_rel(dev, REL_Y, -buf[1]);
  76                         buf[0] = data - data / 2;
  77                         break;
  78
  79                 case 2:
  80                 case 4:
  81                         input_report_rel(dev, REL_X, buf[0]);
  82                         input_report_rel(dev, REL_Y, buf[1] - data);
  83                         buf[1] = data / 2;
  84                         break;
  85         }
  86
  87         input_sync(dev);
  88
  89         if (++sermouse->count == 5)
  90                 sermouse->count = 0;
  91 }
  92
  93 /*
  94  * sermouse_process_ms() anlyzes the incoming MS(Z/+/++) bytestream and
  95  * generates events. With prediction it gets 80 updates/sec, assuming
  96  * standard 3-byte packets and 1200 bps.
  97  */
  98
  99 static void sermouse_process_ms(struct sermouse *sermouse, signed char data)
 100 {
 101         struct input_dev *dev = sermouse->dev;
 102         signed char *buf = sermouse->buf;
 103
 104         if (data & 0x40)
 105                 sermouse->count = 0;
 106         else if (sermouse->count == 0)
 107                 return;
 108
 109         switch (sermouse->count) {
 110
 111                 case 0:
 112                         buf[1] = data;
 113                         input_report_key(dev, BTN_LEFT,   (data >> 5) & 1);
 114                         input_report_key(dev, BTN_RIGHT,  (data >> 4) & 1);
 115                         break;
 116
 117                 case 1:
 118                         buf[2] = data;
 119                         data = (signed char) (((buf[1] << 6) & 0xc0) | (data & 0x3f));
 120                         input_report_rel(dev, REL_X, data / 2);
 121                         input_report_rel(dev, REL_Y, buf[4]);
 122                         buf[3] = data - data / 2;
 123                         break;
 124
 125                 case 2:
 126                         /* Guessing the state of the middle button on 3-button MS-protocol mice - ugly. */
 127                         if ((sermouse->type == SERIO_MS) && !data && !buf[2] && !((buf[0] & 0xf0) ^ buf[1]))
 128                                 input_report_key(dev, BTN_MIDDLE, !test_bit(BTN_MIDDLE, dev->key));
 129                         buf[0] = buf[1];
 130
 131                         data = (signed char) (((buf[1] << 4) & 0xc0) | (data & 0x3f));
 132                         input_report_rel(dev, REL_X, buf[3]);
 133                         input_report_rel(dev, REL_Y, data - buf[4]);
 134                         buf[4] = data / 2;
 135                         break;
 136
 137                 case 3:
 138
 139                         switch (sermouse->type) {
 140
 141                                 case SERIO_MS:
 142                                         sermouse->type = SERIO_MP;
 143                                         /* fall through */
 144
 145                                 case SERIO_MP:
 146                                         if ((data >> 2) & 3) break;     /* M++ Wireless Extension packet. */
 147                                         input_report_key(dev, BTN_MIDDLE, (data >> 5) & 1);
 148                                         input_report_key(dev, BTN_SIDE,   (data >> 4) & 1);
 149                                         break;
 150
 151                                 case SERIO_MZP:
 152                                 case SERIO_MZPP:
 153                                         input_report_key(dev, BTN_SIDE,   (data >> 5) & 1);
 154                                         /* fall through */
 155
 156                                 case SERIO_MZ:
 157                                         input_report_key(dev, BTN_MIDDLE, (data >> 4) & 1);
 158                                         input_report_rel(dev, REL_WHEEL,  (data & 8) - (data & 7));
 159                                         break;
 160                         }
 161
 162                         break;
 163
 164                 case 4:
 165                 case 6: /* MZ++ packet type. We can get these bytes for M++ too but we ignore them later. */
 166                         buf[1] = (data >> 2) & 0x0f;
 167                         break;
 168
 169                 case 5:
 170                 case 7: /* Ignore anything besides MZ++ */
 171                         if (sermouse->type != SERIO_MZPP)
 172                                 break;
 173
 174                         switch (buf[1]) {
 175
 176                                 case 1: /* Extra mouse info */
 177
 178                                         input_report_key(dev, BTN_SIDE, (data >> 4) & 1);
 179                                         input_report_key(dev, BTN_EXTRA, (data >> 5) & 1);
 180                                         input_report_rel(dev, data & 0x80 ? REL_HWHEEL : REL_WHEEL, (data & 7) - (data & 8));
 181
 182                                         break;
 183
 184                                 default: /* We don't decode anything else yet. */
 185
 186                                         printk(KERN_WARNING
 187                                                 "sermouse.c: Received MZ++ packet %x, don't know how to handle.\n", buf[1]);
 188                                         break;
 189                         }
 190
 191                         break;
 192         }
 193
 194         input_sync(dev);
 195
 196         sermouse->count++;
 197 }
 198
 199 /*
 200  * sermouse_interrupt() handles incoming characters, either gathering them into
 201  * packets or passing them to the command routine as command output.
 202  */
 203
 204 static irqreturn_t sermouse_interrupt(struct serio *serio,
 205                 unsigned char data, unsigned int flags)
 206 {
 207         struct sermouse *sermouse = serio_get_drvdata(serio);
 208
 209         if (time_after(jiffies, sermouse->last + HZ/10))
 210                 sermouse->count = 0;
 211
 212         sermouse->last = jiffies;
 213
 214         if (sermouse->type > SERIO_SUN)
 215                 sermouse_process_ms(sermouse, data);
 216         else
 217                 sermouse_process_msc(sermouse, data);
 218
 219         return IRQ_HANDLED;
 220 }
 221
 222 /*
 223  * sermouse_disconnect() cleans up after we don't want talk
 224  * to the mouse anymore.
 225  */
 226
 227 static void sermouse_disconnect(struct serio *serio)
 228 {
 229         struct sermouse *sermouse = serio_get_drvdata(serio);
 230
 231         serio_close(serio);
 232         serio_set_drvdata(serio, NULL);
 233         input_unregister_device(sermouse->dev);
 234         kfree(sermouse);
 235 }
 236
 237 /*
 238  * sermouse_connect() is a callback form the serio module when
 239  * an unhandled serio port is found.
 240  */
 241
 242 static int sermouse_connect(struct serio *serio, struct serio_driver *drv)
 243 {
 244         struct sermouse *sermouse;
 245         struct input_dev *input_dev;
 246         unsigned char c = serio->id.extra;
 247         int err = -ENOMEM;
 248
 249         sermouse = kzalloc(sizeof(struct sermouse), GFP_KERNEL);
 250         input_dev = input_allocate_device();
 251         if (!sermouse || !input_dev)
 252                 goto fail1;
 253
 254         sermouse->dev = input_dev;
 255         snprintf(sermouse->phys, sizeof(sermouse->phys), "%s/input0", serio->phys);
 256         sermouse->type = serio->id.proto;
 257
 258         input_dev->name = sermouse_protocols[sermouse->type];
 259         input_dev->phys = sermouse->phys;
 260         input_dev->id.bustype = BUS_RS232;
 261         input_dev->id.vendor  = sermouse->type;
 262         input_dev->id.product = c;
 263         input_dev->id.version = 0x0100;
 264         input_dev->dev.parent = &serio->dev;
 265
 266         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 267         input_dev->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
 268                 BIT_MASK(BTN_RIGHT);
 269         input_dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 270
 271         if (c & 0x01) set_bit(BTN_MIDDLE, input_dev->keybit);
 272         if (c & 0x02) set_bit(BTN_SIDE, input_dev->keybit);
 273         if (c & 0x04) set_bit(BTN_EXTRA, input_dev->keybit);
 274         if (c & 0x10) set_bit(REL_WHEEL, input_dev->relbit);
 275         if (c & 0x20) set_bit(REL_HWHEEL, input_dev->relbit);
 276
 277         serio_set_drvdata(serio, sermouse);
 278
 279         err = serio_open(serio, drv);
 280         if (err)
 281                 goto fail2;
 282
 283         err = input_register_device(sermouse->dev);
 284         if (err)
 285                 goto fail3;
 286
 287         return 0;
 288
 289  fail3: serio_close(serio);
 290  fail2: serio_set_drvdata(serio, NULL);
 291  fail1: input_free_device(input_dev);
 292         kfree(sermouse);
 293         return err;
 294 }
 295
 296 static struct serio_device_id sermouse_serio_ids[] = {
 297         {
 298                 .type   = SERIO_RS232,
 299                 .proto  = SERIO_MSC,
 300                 .id     = SERIO_ANY,
 301                 .extra  = SERIO_ANY,
 302         },
 303         {
 304                 .type   = SERIO_RS232,
 305                 .proto  = SERIO_SUN,
 306                 .id     = SERIO_ANY,
 307                 .extra  = SERIO_ANY,
 308         },
 309         {
 310                 .type   = SERIO_RS232,
 311                 .proto  = SERIO_MS,
 312                 .id     = SERIO_ANY,
 313                 .extra  = SERIO_ANY,
 314         },
 315         {
 316                 .type   = SERIO_RS232,
 317                 .proto  = SERIO_MP,
 318                 .id     = SERIO_ANY,
 319                 .extra  = SERIO_ANY,
 320         },
 321         {
 322                 .type   = SERIO_RS232,
 323                 .proto  = SERIO_MZ,
 324                 .id     = SERIO_ANY,
 325                 .extra  = SERIO_ANY,
 326         },
 327         {
 328                 .type   = SERIO_RS232,
 329                 .proto  = SERIO_MZP,
 330                 .id     = SERIO_ANY,
 331                 .extra  = SERIO_ANY,
 332         },
 333         {
 334                 .type   = SERIO_RS232,
 335                 .proto  = SERIO_MZPP,
 336                 .id     = SERIO_ANY,
 337                 .extra  = SERIO_ANY,
 338         },
 339         { 0 }
 340 };
 341
 342 MODULE_DEVICE_TABLE(serio, sermouse_serio_ids);
 343
 344 static struct serio_driver sermouse_drv = {
 345         .driver         = {
 346                 .name   = "sermouse",
 347         },
 348         .description    = DRIVER_DESC,
 349         .id_table       = sermouse_serio_ids,
 350         .interrupt      = sermouse_interrupt,
 351         .connect        = sermouse_connect,
 352         .disconnect     = sermouse_disconnect,
 353 };
 354
 355 module_serio_driver(sermouse_drv);